Why is my top speed 70 mph?

After Rustys first test, I would be checking the cam timing. 318s are known to jump any time after 90,000 miles. They lose power fast when that happens. And while the valve cover(s) is/are off you can check the valve spring pressures. And for goodness sakes put a tach on it.A restricted exhaust is a also a good diagnoses.One last idea is a faulty torque convertor, but thats a stretch.

I bought a 71 Demon once a long time ago, knowing it was hard to start. The only way it would run at all was to hold the gas pedal to the floor, and crank the dizzy until it started firing.If I did it just right it would fire up and run, just above idle with the 2bbl butterfly WOT. I forget how many teeth the chain had jumped. Might have been 7? IDK.Anyway, cheap fix. I made a little coin on it several times. It was a heap. I would sell it to one of my younger brothers friends for $350 or so with the agreement that I would buy it back at any time, for maybe $50 or so.I cant remember how many times that deal was made. Eventually I parted it out. The tranny in that car was the best shifting OEM 904 I ever came across. I took it apart and built 2 clones.I think I might still have one in my stash somewhere. Just reminiscing.